WIP

lib/runtime/js_of_ocaml_runtime_stubs.c

@@ -220,6 +220,14 @@ void caml_list_to_js_array () {
   caml_fatal_error("Unimplemented Javascript primitive caml_list_to_js_array!");
 }
 
+void caml_ml_channel_redirect () {
+  caml_fatal_error("Unimplemented Javascript primitive caml_ml_channel_redirect!");
+}
+
+void caml_ml_channel_restore () {
+  caml_fatal_error("Unimplemented Javascript primitive caml_ml_channel_restore!");
+}
+
 void caml_ml_set_channel_output () {
   caml_fatal_error("Unimplemented Javascript primitive caml_ml_set_channel_output!");
 }

lib/runtime/jsoo_runtime.ml

@@ -116,6 +116,14 @@ module Sys = struct
 
   external unmount : string -> unit = "caml_unmount"
 
+  type redirection
+
+  external redirect_channel : out_channel -> into:out_channel -> redirection
+    = "caml_ml_channel_redirect"
+
+  external restore_channel : out_channel -> redirection -> unit
+    = "caml_ml_channel_restore"
+
   module Config = struct
     external use_js_string : unit -> bool = "caml_jsoo_flags_use_js_string"
 

runtime/io.js

@@ -129,6 +129,28 @@ caml_ml_channels_state.prototype.all = function () {
 
 var caml_ml_channels = new caml_ml_channels_state;
 
+//Provides: caml_ml_channel_redirect
+//Requires: caml_ml_channels
+function caml_ml_channel_redirect (captured, into){
+  var to_restore = caml_ml_channels.get(captured);
+  var new_ = caml_ml_channels.get(into);
+  caml_ml_channels.set(captured, new_);
+  return to_restore;
+}
+
+//Provides: caml_ml_channel_restore
+//Requires: caml_ml_channels
+function caml_ml_channel_restore (captured, to_restore){
+  caml_ml_channels.set(captured, to_restore);
+  return 0;
+}
+
+//Provides: caml_ml_channel_get
+//Requires: caml_ml_channels
+function caml_ml_channel_get(id) {
+  return caml_ml_channels.get(id);
+}
+
 //Provides: caml_ml_out_channels_list
 //Requires: caml_ml_channels
 //Requires: caml_sys_fds